Nitrification inhibitors and the use of polyacids to treat mineral fertilizers containing a nitrification inhibitor

• US 6,139,596 A
• Filed: 09/24/1999
• Issued: 10/31/2000
• Est. Priority Date: 08/06/1996
• Status: Expired due to Term

• Current Assignee: BASF AG (BASF SE)
• Original Assignee: BASF AG (BASF SE)
• Inventors: Leibold, Edgar, Gold, Randall Evan, Rittinger, Stefan, Dressel, Jurgen, Rieber, Norbert, Barth, Thomas, Erhardt, Klaus, von Locquengh, Klaus Horchler
• Primary Examiner(s): Dunn, Tom
• Assistant Examiner(s): Warn, Elin A
• Application Number:
  US09/230,841
• Time in Patent Office: 403 Days
• Field of Search: 71/11, 71/28, 71/29, 71/30, 71/33, 71/902, 548/373.1
• US Class Current: 71/28
• CPC Class Codes: C05F 3/00 Fertilisers from human or animal excrements, e.g. manure
• CPC Class Codes: C05G 3/90 for affecting the nitrification of ammonium compounds or urea in the soil
• CPC Class Codes: C07D 231/12 with only hydrogen atoms, hydrocarbon or substituted hydrocarbon radicals, directly attached to ring carbon atoms
• CPC Class Codes: C07D 231/16 Halogen atoms or nitro radicals
• CPC Class Codes: C07D 233/56 with only hydrogen atoms or radicals containing only hydrogen and carbon atoms, attached to ring carbon atoms
• CPC Class Codes: C07D 249/08 1,2,4-Triazoles; Hydrogenated 1,2,4-triazoles
• CPC Class Codes: Y02A 40/20 Fertilizers of biological origin, e.g. guano or fertilizers made from animal corpses
• CPC Class Codes: Y02P 20/145 the feedstock being materials of biological origin
• CPC Class Codes: Y02P 60/21 Dinitrogen oxide [N2O], e.g. using aquaponics, hydroponics or efficiency measures
• CPC Class Codes: Y10S 71/902 Nitrification inhibition

Abstract

The use of inorganic or organic polyacids for the treatment of inorganic fertilizers, in particular the use of the polyacids as a mixture with at least one nitrification inhibitor for the treatment of inorganic fertilizers; the use of selected pyrazole derivatives as nitrification inhibitor in inorganic fertilizers and also as stabilizers of liquid manure or liquid fertilizer formulations, as well as the corresponding treated inorganic fertilizers per se; and novel pyrazole derivatives which can be used as nitrification inhibitors in inorganic fertilizers and also as stabilizers of liquid manure or liquid fertilizer formulations are described.

Claims

1. A pyrazole derivative selected from the group consisting of

N-hydroxymethyl-4-chloro-3-methylpyrazole, N-hydroxymethyl-3,4-dimethyl pyrazole,

phosphoric acid addition salt of 3,4-dimethylpyrazole,

phosphoric acid addition salt of 4-chloro-3-methylpyrazole, and

hydrochloride of 3,4-dimethylpyrazole.

2. A method of using a pyrazole derivative as defined in claim 1 as a nitrification inhibitor.

3. An inorganic fertilizer comprising at least one pyrazole derivative as defined in claim 1.

4. An inorganic fertilizer as defined in claim 3 in powder form or in granule form, treated with at least one inorganic or organic polyacid.

5. An inorganic fertilizer as defined in claim 4, where the inorganic or organic polyacid is present in an amount from 0.01 to 1.5% by weight, and the pyrazole derivative is present as nitrification inhibitor in an amount from 0.01 to 1.5% by weight, based on the treated inorganic fertilizer.

6. A pyrazole derivative as defined in claim 1, which is N-hydroxymethyl-4-chloro-3-methylpyrazole.

7. A pyrazole derivative as defined in claim 1, which is N-hydroxymethyl-3,4-dimethylpyrazole.

8. A pyrazole derivative as defined in claim 1, which is phosphoric acid addition salt of 3,4-dimethylpyrazole.

9. A pyrazole derivative as defined in claim 1, which is phosphoric acid addition salt of 4-chloro-3-methylpyrazole.

10. A pyrazole derivative as defined in claim 1, which is hydrochloride of 3,4-dimethylpyrazole.

11. A mixture of two or more pyrazole derivatives as defined in claim 1.